CN101320427A - Video monitoring method and system with auxiliary objective monitoring function - Google Patents
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Abstract
A video monitoring method that has auxiliary monitoring function for an object is provided, which comprises the following procedures: a) collecting images in a target area; b) identifying and tracking a monitoring object in the image of target area, so as to acquire the number and/or movement information about the monitoring object; c) carrying out comprehensive statistics and analysis of passenger flow according to the acquired number and/or movement information about the monitoring object. The invention can intelligently assist a safety administrator to manage, so as to effectively reduce the potential safety hazard and save a great amount of management manpower. What is more, with unique background updating mechanism, the invention can ensure more reliable application in places with great passenger flow such as the platform of rail transit, the entrance of department store and entrance of passage. In addition, by tracking the monitoring object according to different passenger flow, the invention not only simplifies the elaborated tracking algorithm, but also ensures better processing effect.
Description
Technical field
The present invention relates to the safety monitoring technology of computer vision field, relate in particular to a kind of video frequency monitoring method and system.
Background technology
Track traffic in the modern city is a kind of mode of transportation very easily, and it is not subjected to the influence of weather and traffic, can carry the passenger and arrive the destination on time, so people enjoys a lot to select track traffic as trip mode.But because urban population is numerous, majority wish to arrive the destination again on time, therefore make that the volume of the flow of passengers of track traffic is very big.Usually on platform, the shield door place of particularly getting on the bus and getting off, crowded especially part also is the easiest place of causing security incident simultaneously.Carry out behavior adjustment management with the security official, need to consume people's great effort, and since crowded, the sight that some be can't see ignored easily.
Existing stream of people's statistical system mainly is to utilize at the scene sensor installation to measure statistics, such device is installed very inconvenient under this scene of similar track traffic, operation and maintenance expensive also bigger, and the stream of people adds up also inaccurate when excessive.
For other public, for example also there are similar problem in market, doorway, park and some entrance and exit of the passage.And except the people,, similar problem is arranged also to other moving targets such as vehicles.
Summary of the invention
Technical matters to be solved by this invention provides a kind of video frequency monitoring method and system that has the auxiliary monitoring function of target, intelligently the auxiliary security keeper manages, thereby reduce potential safety hazard effectively, can save a large amount of managing humans simultaneously.
In order to solve the problems of the technologies described above, the invention provides a kind of video frequency monitoring method that has the auxiliary monitoring function of target, may further comprise the steps:
(a) target area image is gathered;
(b) processing is discerned and followed the tracks of to the monitoring objective in the target area image, obtain the number and/or the movable information of monitoring objective;
(c) number and/or the movable information according to the monitoring objective that obtains carries out stream of people's situation comprehensive statistics and analysis.
Further, step (b) is divided into following steps:
Background modeling filters target area image, obtains background image and upgrades;
Obtain the monitoring objective image, the difference value that deducts the pixel that obtains after current background image and basis are subtracted each other from current frame image is selected the pixel of monitoring objective image, obtains the monitoring objective image as prospect;
Identification and tracking are discerned the monitoring objective in the monitoring objective image earlier, then the monitoring objective that identifies are followed the tracks of.
Further, when carrying out background modeling, be that target area image is carried out the multiframe medium filtering, and judging whether the intermediate value variation surpasses a preset threshold value, if do not surpass, is new background image with filtered image update then, if surpass, then background image is not upgraded.
Further, when obtaining the monitoring objective image, from current frame image, deduct the current background image,, earlier the difference value after subtracting each other is weighted value transform each pixel on the image, judge that more whether value after the conversion is greater than a preset threshold value, if greater than, then determine that it is the pixel in the monitoring objective image, after each pixel is handled, the noise and the target that adopt morphologic corrosion expanding method further to eliminate are wherein again disturbed, and obtain the monitoring objective image.
Further, when monitoring objective is discerned and is followed the tracks of, earlier the monitoring objective in the monitoring objective image is discerned, obtain the number of monitoring objective in the image and compare with a preset threshold, when greater than or during more than or equal to this threshold value, adopt the average moving method that the moving target in the monitoring objective image is carried out trace analysis, otherwise carry out trace analysis, obtain the movable information of monitoring objective behind the trace analysis with the approximate all foreground targets of a plurality of ellipses.
Further,
After step (c) is carried out comprehensive statistics and analyzed, as the alert if that meets setting then reports to the police, and comprises in the following processing one or more:
The information of number of monitoring objective is compared with stream of people's alarm threshold value of presetting, promptly notify warning device to report to the police as surpassing this threshold value;
According to the movable information of monitoring objective and judged whether that abnormal behaviour takes place, comprise: the direction of motion according to monitoring objective has judged whether that retrograde situation takes place, and/or judge whether that according to the monitoring objective position someone carries out the hazardous location, take place then to report to the police if any abnormal behaviour.
Further, when obtaining the monitoring objective image, the formula that difference value is weighted value transform is as follows:
In the formula:
I presentation video coordinate points;
x
iThe prospect value of representing the i coordinate points;
B
iThe background value of representing the i coordinate points;
σ represents the anti-noise smoothing parameter, determines according to the picture noise size usually;
Exp is expressed as the exponent arithmetic symbol.
A kind of video monitoring system that has the auxiliary monitoring function of target provided by the invention comprises the data collector, initial treatment device, comprehensive statistics analytical equipment and the warning device that connect successively, wherein:
Data collector is made up of one group of camera, is used for the image in photographic subjects zone and outputs to corresponding initial treatment device.
The initial treatment device is used for the target area image of receiving is carried out identification that monitoring objective is the people and followed the tracks of and handle, and the monitoring objective information that obtains and output to the comprehensive statistics analytical equipment;
The comprehensive statistics analytical equipment is used for according to the monitoring objective information of receiving monitoring objective being carried out the various actions analysis.
Further, the initial treatment module comprises background modeling unit, foreground target detecting unit and the target following unit that connects successively, wherein:
The background modeling unit is used for target area image is filtered, and obtains background image and upgrades;
The foreground target detecting unit is used for deducting the current background image is also selected the monitoring objective image according to the difference value of the pixel that obtains after subtracting each other pixel from current frame image, obtains the monitoring objective image as prospect;
The target following unit is used for earlier the monitoring objective of monitoring objective image being discerned, and then the monitoring objective that identifies is followed the tracks of.
Further, the background modeling unit is when carrying out background modeling, be that target area image is carried out the multiframe medium filtering, and judge whether the intermediate value variation surpasses a preset threshold value, if do not surpass, be new background image then,, then background image do not upgraded if surpass with filtered image update.
Further, the foreground target detecting unit further comprises:
Initial target obtains subelement, be used to receive moving region image and background image, after from current frame image, deducting the current background image, to each pixel on two width of cloth images that obtain, earlier to the conversion of the difference value value of being weighted after subtracting each other, judge again after the conversion value whether greater than or more than or equal to a preset threshold value, only when this condition is set up, this pixel as the pixel in the monitoring objective image, is handled the monitoring objective image that back output obtains to each pixel;
Noise and interference eliminated subelement, be used to receive the described monitoring objective image that initial target obtains subelement output, after adopting the further noise of eliminating wherein and target interference of morphologic corrosion expanding method, output to the target following unit as the monitoring objective image.
Further, the target following unit further comprises:
Flow is judged subelement, be used for discerning according to monitoring objective to the monitoring objective image received, obtain the number of monitoring objective in the image and compare with a preset threshold, when greater than or during more than or equal to this threshold value, triggering low discharge target following subelement handles, otherwise, triggering big flow target following subelement and handle, the information of number with monitoring objective sends to the comprehensive statistics analytical equipment simultaneously;
Low discharge target following subelement is used for adopting the average moving method that the moving target of monitoring objective image is carried out trace analysis, obtains the movable information of monitoring objective and sends to the comprehensive statistics analytical equipment;
Big flow target following subelement is used to adopt foreground target ovalization method, promptly carries out trace analysis with the approximate all foreground targets of a plurality of ellipses, obtains the movable information of monitoring objective and sends to the comprehensive statistics analytical equipment.
Further, system of the present invention also comprises warning device, wherein:
After the comprehensive statistics analytical equipment carries out behavioural analysis, meet when imposing a condition, notify this warning device as judgement;
Described warning device is used for reporting to the police after receiving described notice.
Further, system of the present invention also comprises a warning device, and the comprehensive statistics analytical equipment further comprises:
The flow analysis unit is used to receive the information of number of monitoring objective, compares with default stream of people's alarm threshold value, and promptly to notify warning device to report to the police and indicate warning reason be that the flow of monitoring objective is excessive as surpassing this threshold value;
The abnormal behaviour analytic unit, be used to receive the movable information of monitoring objective and judged whether that abnormal behaviour takes place, comprise that the direction of motion according to monitoring objective has judged whether that retrograde situation takes place, and/or judging whether that according to the monitoring objective position someone carries out the hazardous location, the notice warning device is reported to the police and has been indicated abnormal behaviour when taking place if any abnormal behaviour;
The movable information of the monitoring objective that low discharge target following subelement and big flow target following subelement obtain comprises the positional information and/or the direction of motion information of monitoring objective.
Further, this video monitoring system is the video monitoring system of rail traffic platform, and described target area comprises car door place up and down, and described monitoring objective is behaved.
The present invention intelligently auxiliary security keeper manages, thereby reduces potential safety hazard effectively, can save a large amount of managing humans simultaneously.Further, by the unique background update mechanism, more reliable to the application of the very big scene of rail traffic platform, doorway, market, passage doorway or the like flow of the people; Carry out target following at the different people traffic differentiation in addition and handle, both simplified the track algorithm of existing too refinement, also make better processing effect.
Description of drawings
Fig. 1 is the structured flowchart of embodiment of the invention video monitoring system;
Fig. 2 is the unit block diagram of initial treatment device among Fig. 1;
Fig. 3 is the process flow diagram of embodiment of the invention video frequency monitoring method.
Embodiment
The present invention gathers and carries out target detection behind the image of target area and follow the tracks of and handle, and according to detecting and tracking results is carried out the various actions analysis to monitoring objective, when analyzing unusual condition, send corresponding alerting signal by warning device, the safety manager involves in management with prompting.
Video monitoring system with rail traffic platform is an example below, in conjunction with the accompanying drawings technical scheme of the present invention is set forth in more detail.
As shown in Figure 1, be the structured flowchart of the embodiment of the invention.This system comprises data collector, initial treatment device, comprehensive statistics analytical equipment and the warning device that connects successively; Wherein:
Data collector, (1～N) forms by one group of camera, this group camera is installed in the top of each self-corresponding target area, and the general mode of taking a crane shot that adopts is used for the as above image in exit door place or some prohibited areas and output to corresponding initial treatment device of photographic subjects zone.
The initial treatment device, form by one group of initial treatment module corresponding to N camera, be used for the target area image of receiving is carried out identification that monitoring objective is the people and followed the tracks of and handle, and the quantity of monitoring objective information that obtains such as monitoring objective, direction of motion etc. output to the comprehensive statistics analytical equipment;
The comprehensive statistics analytical equipment is used for monitoring objective being carried out the various actions analysis and notify warning device when conforming to a predetermined condition according to the monitoring objective information of receiving, when driving in the wrong direction if any the people, when flow of the people is excessive, man-hour or the like is arranged in the hazardous location.
Warning device is used for reporting to the police after notified, involves in management to remind the safety officer.
Fig. 2 has provided the block diagram of each initial treatment module in the initial treatment device of said system of the present invention.This initial treatment module 100 comprises background modeling unit 110, foreground target detecting unit 120 and the target following unit 130 that connects successively, wherein:
So-called multiframe medium filtering is promptly to each pixel on the image, sort according to the value of this pixel in each frame, with the value of the pixel in the middle of coming as filtering after the value of this pixel in the image.Because this special scene of platform can occur that the stream of people is very big for a moment, the less situation of the stream of people for a moment is if directly use the multiframe medium filtering not to be well suited for, because this update mode can be used as background to the people when big and duration is longer at flow of the people.By increasing a threshold value corresponding to the intermediate value variation, when the intermediate value variation promptly changes greatly above this threshold value, people's process has been described, background is not upgraded at this moment, have only and when the intermediate value variation that obtains is no more than this threshold value, just upgrade background.
Foreground target detecting unit 120, be used to receive moving region image and background image, the difference value that deducts the pixel that obtains after current background image and basis are subtracted each other from current frame image is selected the pixel of monitoring objective image, obtains the monitoring objective image as prospect.This unit further comprises:
Initial target obtains subelement 1201, be used to receive moving region image and background image, after from current frame image, deducting the current background image, to each pixel on two width of cloth images that obtain, earlier to the conversion of the difference value value of being weighted after subtracting each other, judge again after the conversion value whether greater than or more than or equal to a preset threshold value, only when this condition is set up, this pixel as the pixel in the monitoring objective image, is handled the monitoring objective image that back output obtains to each pixel.
A kind of formula of weighted transformation is as follows:
In the formula:
I presentation video coordinate points;
x
iThe prospect value of representing the i coordinate points;
B
iThe background value of representing the i coordinate points;
σ represents the anti-noise smoothing parameter, determines according to the picture noise size usually;
Exp is expressed as the exponent arithmetic symbol.
Noise and interference eliminated subelement 1202 are used to receive described monitoring objective image, adopt morphologic corrosion expanding method further to eliminate noise wherein and after target disturbs, output to the target following unit as the monitoring objective image.
Flow is judged subelement 1301, be used for discerning according to monitoring objective to the monitoring objective image received, obtain the number of monitoring objective in the image and compare with a preset threshold, when greater than or during more than or equal to this threshold value, triggering low discharge target following subelement 1302 handles, otherwise, triggering big flow target following subelement 1303 and handle, the information of number with monitoring objective sends to the comprehensive statistics analytical equipment simultaneously.
Low discharge target following subelement 1302, be used for adopting average migration Meanshift method that the moving target of monitoring objective image is carried out trace analysis, obtain movable information such as positional information, the direction of motion information of monitoring objective and send to the comprehensive statistics analytical equipment.
Big flow target following subelement 1303 is used to adopt foreground target ovalization method, promptly carries out trace analysis with the approximate all foreground targets of a plurality of ellipses, obtains the movable information of monitoring objective and sends to the comprehensive statistics analytical equipment.
The comprehensive statistics analytical equipment can be arranged on the interior industrial computer of track traffic Master Control Room, further comprises with lower unit:
The flow analysis unit is used to receive the information of number of monitoring objective, compares with default stream of people's alarm threshold value, and promptly to notify warning device to report to the police and indicate warning reason be that the flow of monitoring objective is excessive as surpassing this threshold value.
The abnormal behaviour analytic unit, be used to receive the movable information of monitoring objective and judged whether that abnormal behaviour takes place, judged whether that as direction of motion retrograde situation takes place according to monitoring objective, judge whether that according to the monitoring objective position someone carries out hazardous location etc., the notice warning device is reported to the police and has been indicated abnormal behaviour when having abnormal behaviour to take place.
Warning device is used for reporting to the police after receiving above-mentioned notice, and can provides corresponding prompt information, involves in management to remind the safety officer.
The flow process of present embodiment video frequency monitoring method as shown in Figure 3.This flow process comprises the steps:
210: target area image is gathered;
220: processing is discerned and followed the tracks of to the monitoring objective in the target area image, obtain the number of monitoring objective and movable information (or one of them);
This step can be divided into background modeling, obtains the monitoring objective image, and monitoring objective is discerned and processing such as tracking, wherein:
During background modeling, be that target area image is carried out the multiframe medium filtering, and judge whether the intermediate value variation surpasses a preset threshold value, if do not surpass, be new background image then,, then background image do not upgraded if surpass with filtered image update.
When obtaining the monitoring objective image, be from current frame image, to deduct the current background image is also selected the monitoring objective image according to the difference value of the pixel that obtains after subtracting each other pixel, obtain monitoring objective image as prospect.Particularly, to each pixel on the image, can be earlier to the conversion of the difference value value of being weighted after subtracting each other, judge that more whether value after the conversion is greater than a preset threshold value, if greater than, then determine that it is the pixel in the monitoring objective image, can obtain the monitoring objective image after each pixel is handled, can also adopt morphologic corrosion expanding method further to eliminate wherein noise and the target identification and the tracking that are used further to monitoring objective after disturbing this monitoring objective image.
When monitoring objective is discerned and is followed the tracks of, earlier the monitoring objective in the monitoring objective image is discerned, obtain the number of monitoring objective in the image and compare with a preset threshold, when greater than or during more than or equal to this threshold value, adopt average migration Meanshift method that the moving target in the monitoring objective image is carried out trace analysis, otherwise carry out trace analysis with the approximate all foreground targets of a plurality of ellipses, need to obtain movable information such as positional information, the direction of motion information etc. of monitoring objective behind the trace analysis.
230: number and movable information according to the monitoring objective that obtains carry out stream of people's situation comprehensive statistics and analysis, as the alert if that meets setting then sends corresponding warning, remind the Security Officer to involve in management.
Particularly, the information of number of monitoring objective can be compared with stream of people's alarm threshold value of presetting, promptly notify warning device to report to the police as surpassing this threshold value; Perhaps according to the movable information of monitoring objective and judged whether that abnormal behaviour takes place, judged whether that as direction of motion retrograde situation takes place according to monitoring objective, judge whether that according to the monitoring objective position someone carries out hazardous location etc., the notice warning device is reported to the police and has been indicated abnormal behaviour when having abnormal behaviour to take place.
The above only is the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation, initial treatment device of the present invention subdivision not for example, by to each camera identification code ID, obtain the view data of each camera collection, and carry out corresponding initial treatment.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1. video frequency monitoring method that has the auxiliary monitoring function of target may further comprise the steps:
(a) target area image is gathered;
(b) processing is discerned and followed the tracks of to the monitoring objective in the target area image, obtain the number and/or the movable information of monitoring objective;
(c) number and/or the movable information according to the monitoring objective that obtains carries out stream of people's situation comprehensive statistics and analysis.
2. the method for claim 1 is characterized in that, step (b) is further divided into following steps:
Background modeling filters target area image, obtains background image and upgrades;
Obtain the monitoring objective image, the difference value that deducts the pixel that obtains after current background image and basis are subtracted each other from current frame image is selected the pixel of monitoring objective image, obtains the monitoring objective image as prospect;
Identification and tracking are discerned the monitoring objective in the monitoring objective image earlier, then the monitoring objective that identifies are followed the tracks of.
3. method as claimed in claim 2 is characterized in that:
When carrying out background modeling, be that target area image is carried out the multiframe medium filtering, and judge whether the intermediate value variation surpasses a preset threshold value, if do not surpass, be new background image then,, then background image do not upgraded if surpass with filtered image update.
4. method as claimed in claim 2 is characterized in that:
When obtaining the monitoring objective image, from current frame image, deduct the current background image, to each pixel on the image, earlier the difference value after subtracting each other is weighted value transform, whether judges value after the conversion again greater than a preset threshold value, if greater than, then determine that it is the pixel in the monitoring objective image, after each pixel handled, the noise and the target that adopt morphologic corrosion expanding method further to eliminate were wherein again disturbed, and obtain the monitoring objective image.
5. method as claimed in claim 2 is characterized in that:
When monitoring objective is discerned and is followed the tracks of, earlier the monitoring objective in the monitoring objective image is discerned, obtain the number of monitoring objective in the image and compare with a preset threshold, when greater than or during more than or equal to this threshold value, adopt the average moving method that the moving target in the monitoring objective image is carried out trace analysis, otherwise carry out trace analysis with the approximate all foreground targets of a plurality of ellipses, obtain the movable information of monitoring objective behind the trace analysis.
6. as the described method of arbitrary claim in the claim 1 to 5, it is characterized in that:
After step (c) is carried out comprehensive statistics and analyzed, as the alert if that meets setting then reports to the police, and comprises in the following processing one or more:
The information of number of monitoring objective is compared with stream of people's alarm threshold value of presetting, promptly notify warning device to report to the police as surpassing this threshold value;
According to the movable information of monitoring objective and judged whether that abnormal behaviour takes place, comprise: the direction of motion according to monitoring objective has judged whether that retrograde situation takes place, and/or judge whether that according to the monitoring objective position someone carries out the hazardous location, take place then to report to the police if any abnormal behaviour.
7. method as claimed in claim 4 is characterized in that, when obtaining the monitoring objective image, the formula that difference value is weighted value transform is as follows:
In the formula:
I presentation video coordinate points;
x
iThe prospect value of representing the i coordinate points;
B
iThe background value of representing the i coordinate points;
σ represents the anti-noise smoothing parameter, determines according to the picture noise size usually;
Exp is expressed as the exponent arithmetic symbol.
8. a video monitoring system that has the auxiliary monitoring function of target is characterized in that, comprises the data collector, initial treatment device, comprehensive statistics analytical equipment and the warning device that connect successively, wherein:
Described data collector is made up of one group of camera, is used for the image in photographic subjects zone and outputs to corresponding initial treatment device.
Described initial treatment device is used for the target area image of receiving is carried out identification that monitoring objective is the people and followed the tracks of and handle, and the monitoring objective information that obtains and output to the comprehensive statistics analytical equipment;
Described comprehensive statistics analytical equipment is used for according to the monitoring objective information of receiving monitoring objective being carried out the various actions analysis.
9. video monitoring system as claimed in claim 8 is characterized in that, described initial treatment module comprises background modeling unit, foreground target detecting unit and the target following unit that connects successively, wherein:
Described background modeling unit is used for target area image is filtered, and obtains background image and upgrades;
Described foreground target detecting unit is used for deducting the current background image is also selected the monitoring objective image according to the difference value of the pixel that obtains after subtracting each other pixel from current frame image, obtains the monitoring objective image as prospect;
Described target following unit is used for earlier the monitoring objective of monitoring objective image being discerned, and then the monitoring objective that identifies is followed the tracks of.
10. video monitoring system as claimed in claim 9 is characterized in that:
Described background modeling unit is when carrying out background modeling, be that target area image is carried out the multiframe medium filtering, and judge whether the intermediate value variation surpasses a preset threshold value, if do not surpass, be new background image then with filtered image update, if surpass, then background image is not upgraded.
11. video monitoring system as claimed in claim 9 is characterized in that, described foreground target detecting unit further comprises:
Initial target obtains subelement, be used to receive moving region image and background image, after from current frame image, deducting the current background image, to each pixel on two width of cloth images that obtain, earlier to the conversion of the difference value value of being weighted after subtracting each other, judge again after the conversion value whether greater than or more than or equal to a preset threshold value, only when this condition is set up, this pixel as the pixel in the monitoring objective image, is handled the monitoring objective image that back output obtains to each pixel;
Noise and interference eliminated subelement, be used to receive the described monitoring objective image that initial target obtains subelement output, after adopting the further noise of eliminating wherein and target interference of morphologic corrosion expanding method, output to the target following unit as the monitoring objective image.
12. video monitoring system as claimed in claim 9 is characterized in that, described target following unit further comprises:
Flow is judged subelement, be used for discerning according to monitoring objective to the monitoring objective image received, obtain the number of monitoring objective in the image and compare with a preset threshold, when greater than or during more than or equal to this threshold value, triggering low discharge target following subelement handles, otherwise, triggering big flow target following subelement and handle, the information of number with monitoring objective sends to the comprehensive statistics analytical equipment simultaneously;
Low discharge target following subelement is used for adopting the average moving method that the moving target of monitoring objective image is carried out trace analysis, obtains the movable information of monitoring objective and sends to the comprehensive statistics analytical equipment;
Big flow target following subelement is used to adopt foreground target ovalization method, promptly carries out trace analysis with the approximate all foreground targets of a plurality of ellipses, obtains the movable information of monitoring objective and sends to the comprehensive statistics analytical equipment.
13., it is characterized in that as the described video monitoring system of arbitrary claim in the claim 8 to 12, also comprise warning device, wherein:
After described comprehensive statistics analytical equipment carries out behavioural analysis, meet when imposing a condition, notify described warning device as judgement;
Described warning device is used for reporting to the police after receiving described notice.
14. video monitoring system as claimed in claim 12 is characterized in that, also comprises a warning device, and described comprehensive statistics analytical equipment further comprises:
The flow analysis unit is used to receive the information of number of monitoring objective, compares with default stream of people's alarm threshold value, and promptly to notify warning device to report to the police and indicate warning reason be that the flow of monitoring objective is excessive as surpassing this threshold value;
The abnormal behaviour analytic unit, be used to receive the movable information of monitoring objective and judged whether that abnormal behaviour takes place, comprise that the direction of motion according to monitoring objective has judged whether that retrograde situation takes place, and/or judging whether that according to the monitoring objective position someone carries out the hazardous location, the notice warning device is reported to the police and has been indicated abnormal behaviour when taking place if any abnormal behaviour;
The movable information of the monitoring objective that described low discharge target following subelement and big flow target following subelement obtain comprises the positional information and/or the direction of motion information of monitoring objective.
15. video monitoring system as claimed in claim 8 is characterized in that:
This video monitoring system is the video monitoring system of rail traffic platform, and described target area comprises car door place up and down, and described monitoring objective is behaved.
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